Follow-up · depth 7
Design a small subsystem that relies on Eager vs Explicit Loading
Design a small subsystem that relies on Eager vs Explicit Loading
Answers use simple, clear English.
Quick interview answer
Sketch components, data flow, failure modes, and metrics around Eager vs Explicit Loading. Example shape: Order list with items: .Include(o => o.Items) prevents N+1 when rendering line counts.
Detailed answer
Mini design using Eager vs Explicit Loading: • Components: API edge, worker/queue, store, and observability. • Data flow: request → Eager vs Explicit Loading-related path → response/async side effects. • Failure modes: timeouts, overload, partial dependency loss. • Metrics: latency, errors, saturation for the Eager vs Explicit Loading path. Guardrails: Prefer Select projection DTOs; AsSplitQuery for multiple collections. Parent context: Mitigate first, then root-cause. Check symptoms against: Lazy loading enabled globally causing hidden N+1 in foreach..
Full explanation
Interviewers want a crisp architecture story anchored on Eager vs Explicit Loading, not a buzzword list. Include/ThenInclude eager-loads related data in one query. Explicit loading: reference/load after query. Avoid lazy loading in web apps (N+1 in loops).
Follow-up questions
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Parent context — Eager vs Explicit Loading
Mitigate first, then root-cause. Check symptoms against: Lazy loading enabled globally causing hidden N+1 in foreach..
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